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__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
Internet Information Server Vulnerability
April 18, 1997 17:00 GMT Number H-48
______________________________________________________________________________
PROBLEM: A vulnerability in Microsoft IIS allows an outside user to view
server-side scripts.
PLATFORM: Windows NT servers running Internet Information Server 2.0 or
3.0.
DAMAGE: An outside user can obtain access to sensitive Web server
scripts.
SOLUTION: Apply the fix or patch provided below.
______________________________________________________________________________
VULNERABILITY If sensitive information such as passwords are present in a
ASSESSMENT: server-side script, this vulnerability can potentially lead to
compromised of a Web server.
______________________________________________________________________________
A vulnerability in Microsoft Internet Information Server (IIS) for
Windows NT 4.0 allows server scripts to be view by the client
side. Server-side scripts (also called script-mapped files) are
programs that produce HTML code to be viewed on the client side. It is
not intended that the scripts themselves be seen on the client side.
Commonly, server scripts contain sensitive information, such as
passwords for accessing databases. Or, seeing the content of a script
might allow an attacker to discover a way to attack the server.
To view a server script, the client user needs to simply append one or
more dots (.) to the end of the URL. For example, the URL
http://foo.bar.org/myscript.asp.
will return the contents of the script myscript.asp, not the results
of executing the script.
All server-side scripts requested from a virtual directory that have
both read and execute permissions are vulnerable. This includes .asp,
.htx, .idc, .pl, and other types of files.
The vulnerability can be removed by disabling "read" permissions on
the virtual directory where such scripts reside. Or, the following patch
can be downloaded from Microsoft:
ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/
usa/nt40/hotfixes-postsp2/iis-fix
Microsoft has made information on this vulnerability available on
their Web site at:
http://www.microsoft.com/iis/iisnews/hotnews/security.htm
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Microsoft and Juan T. Llibre
for the information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 510-422-8193
FAX: +1 510-423-8002
STU-III: +1 510-423-2604
E-mail: ciac@llnl.gov
For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 510-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://ciac.llnl.gov/
Anonymous FTP: ciac.llnl.gov (128.115.19.53)
Modem access: +1 (510) 423-4753 (28.8K baud)
+1 (510) 423-3331 (28.8K baud)
CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
information and Bulletins, important computer security information;
2. CIAC-NOTES for Notes, a collection of computer security articles;
3. SPI-ANNOUNCE for official news about Security Profile Inspector
(SPI) software updates, new features, distribution and
availability;
4. SPI-NOTES, for discussion of problems and solutions regarding the
use of SPI products.
Our mailing lists are managed by a public domain software package
called Majordomo, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
ciac-bulletin, ciac-notes, spi-announce OR spi-notes for list-name:
E-mail to ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov:
subscribe list-name
e.g., subscribe ciac-notes
You will receive an acknowledgment email immediately with a confirmation
that you will need to mail back to the addresses above, as per the
instructions in the email. This is a partial protection to make sure
you are really the one who asked to be signed up for the list in question.
If you include the word 'help' in the body of an email to the above address,
it will also send back an information file on how to subscribe/unsubscribe,
get past issues of CIAC bulletins via email, etc.
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.
LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)
H-38A: Internet Explorer 3.x Vulnerabilities
H-39: SGI IRIX fsdump Vulnerability
H-40: DIGITAL Security Vulnerabilities (DoP, delta-time)
H-41: Solaris 2.x eject Buffer Overrun Vulnerability
H-42: HP MPE/iX with ICMP Echo Request (ping) Vulnerability
H-44: Solaris 2.x fdformat Buffer Overflow Vulnerability
H-45: Windows NT SAM permission Vulnerability
H-46: Vulnerability in IMAP and POP
H-47A: AOL4FREE.COM Trojan Horse Program Destroys Hard Drives
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